16 
~J 
Or 
94. 
TRANSACTIONS AND PROCEEDINGS OF THE [ Sess. LXIX. 
Cl. moniliferum in its greater curvature and thicker apices. The 
outer margin occupied 140° of arc, the curvature thus being nearer 
that of Cl. Leibleiniti. The ventral (or inner) margin was less 
tumid than usual. 
Ci. Ehrenberg, Menegh. 0 —W. of Kirkwall. S.—Lerwick ; 
Bressay. Plankton of Loch Beosetter, Bressay, and of Neugles 
Water. 
Cl. aceroswum (Schrank), Ehrenb. O.—Hoy; pond near Kirkwall. 
S.—Near Lerwick ; plankton of Loch Asta. 
7. Cl. lanceolatum, Kiitz. O.—Kirkwall. S.—Lerwick. 
78. Cl. Lunula (Miill.), Nitzsch. 0O.—Finstown; Kirkwall ; plankton 
of Loch Kirbister. S.—Near Lerwick, very abundant. 
. Cl. Cornu, Ehrenb. S§.—Scalloway ; plankton of Loch Beosetter, 
Bressay. 
. Cl. abruptum, West. O.—Hoy; Kirkwall. S.—Plankton of Loch 
Beosetter, Bressay. 
. Cl. gracile, Bréb. OU.—Kairkwall. %.—Bressay. 
i 
Var. tenue (Lemm.), W. and G. 8S. West. O.—W. of Kirkwall. 
S.—Scalloway. 
. Cl. Pritchardianum, Arch. 0.—Hoy. 
Cl. pronum, Bréb. O.—Pond near Kirkwall. Long. 4004; lat. 
67m. 
4, Cl. aciculare, Tuften West. O.—Kirkwall. 
Var. subpronum, W.and G. S. West. S.—Plankton of Loch Asta. 
. Cl. acutum, Bréb. S.—Lerwick. 
. Cl. rostratum, Ehrenb. O.—Kirkwall; Finstown. S.—Scalloway. 
. Cl. setaceum, Ehrenb. O.—Kirkwall. S.—Bressay. 
Genus PLEUROTZNIUM, Nag. 
. Pl. coronatum (Bréb.), Rabenh., var. nodulosum (Bréb.), West. O.— 
Kirkwall. S.—Near Scalloway. 
39. Pl. truncatum (Bréb.), Nag. Long. 340-412, ; lat. 50-71n. O— 
Kirkwall. S.—Bressay. 
. Pl. Ehrenbergti (Bréb.), De Bary. O.—Kirkwall; Hoy. S.— 
Scalloway ; Bressay. 
. Pl. Trabecula (Ehrenb.), Nag. 0.—Kirkwall ; Finstown ; Hoy. 
Genus TETMEMORUS, Ralfs. 
2. T. Brébissonii (Menegh.), Ralfs. O—Kirkwall; Hoy. 
Var. minor, De Bary. O—Hoy. 
3. T. granulatus (Bréb.), Ralfs. OW—\Kirkwall; Hoy. S.—Lerwick ; 
Scalloway ; Loch Brindister ; Neugles Water ; Bressay, in pools 
and in the plankton of Loch Beosetter. 
Zygospores of this species were noticed from near Kirkwall. 
A curious monstrous form was observed in which only a partial 
fusion of the cell-contents had taken place, although the whole 
was invested with a thick, brown cell-wall (fig. 37). 
Var. attenuatus, West. O—Kirkwall; Hoy. S.—Scalloway : 
Lerwick. 
T. levis (Kiitz), Ralfs. O.—Kirkwall. §.-—Scalloway ; Lerwick ; 
Bressay, in pools and in the plankton of Loch Beosetter. 
Genus EUASTRUM, Ehrenb. 
5. E. oblongum (Grev.), Ralfs. 0.—Kirkwall. S.—Lerwick ; Scallo- 
way ; plankton of Loch Beosetter, Bressay. 
